參數(shù)資料
型號(hào)： LMX2353TMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： XO, clock
英文描述： PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer
中文描述： PHASE LOCKED LOOP, 2500 MHz, PDSO16
封裝： PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 210K
代理商： LMX2353TMX
2.0 Programming Description
(Continued)
2.3.2.4 Power Down Mode
(PWDN_MODE)
Synchronous Power Down Mode
The PLL loop can be synchronously powered down by setting the PWDN mode bit HIGH (F2_19=1) and then asserting the power
down mode bit (N20 = 1). The power down function is gated by the charge pump. Once the power down program bit is loaded,
the part will go into power down mode upon the completion of a charge pump pulse event.
Asynchronous Power Down Mode
The PLL loop can be asynchronously powered down by setting the PWDN mode bit LOW (F2_19=0) and then asserting the
power down mode bit (N20 = 1). The power down function is NOT gated by the charge pump. Once the power down program bit
is loaded, the part will go into power down mode immediately.
2.3.3 Feedback Divide Ratio
(NB Counter)
NB_CNTR[9:0]
N_14
0
0
1
Divide Ratio
3
4
1023
N_18
0
0
1
N_17
0
0
1
N_16
0
0
1
N_15
0
0
1
N_13
0
0
1
N_12
0
0
1
N_11
0
1
1
N_10
1
0
1
N_9
1
0
1
Note:
B-counter divide ratio must be
≥
3.
NB_CNTR
≥
(NA_CNTR +2).
2.3.4 Swallow Counter Divide Ratio
(NA Counter)
NB_CNTR[4:0]
N_6
0
0
1
Divide Ratio
0
1
31
N_8
0
0
1
N_7
0
0
1
N_5
0
0
1
N_4
0
1
1
Note:
Swallow Counter Value: 0 to 31.
NB_CNTR
≥
(NA_CNTR +2).
2.3.5 Fractional Modulus Accumulator
(FRAC_CNTR)
Divide
Ratio
Modulus 15
0
1/15
2/15
14/15
N/A
Divide
Ratio
Modulus 16
0
1/16
2/16
14/16
15/16
FRAC_CNTR[3:0]
N_3
0
0
0
1
1
N_2
0
0
0
1
1
N_1
0
0
1
1
1
N_0
0
1
0
0
1
2.3.6 Pulse Swallow Function
f
VCO
= [N+F] x [f
OSC
/R] where N = (PxB) + A
f
VCO
:
Output frequency of external voltage controlled oscillator (VCO)
F:
Fractional ratio (contents of FRAC_CNTR divided by the fractional modulus)
B:
Preset divide ratio of binary 10-bit programmable counter (3 to 1023)
A:
Preset divide ratio of binary 5-bit swallow counter
0
<
A
<
31 {P=32};
0
<
A
<
15 {P=16};
A +2
<
B
f
OSC
:
Output frequency of the external reference frequency oscillator
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相關(guān)PDF資料
PDF描述
LMX2353TM PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LMX2354 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
LMX2354SLB 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
LMX2354SLBX 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LMX2354SLBX/NOPB 功能描述:IC FREQ SYNTH DUAL 24-LAMCSP RoHS:是 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類(lèi)型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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